植被(病理学)
生产力
生态系统
环境科学
自然地理学
气候变化
生长季节
纬度
大气科学
生态学
气候学
地理
地质学
生物
大地测量学
医学
宏观经济学
病理
经济
作者
Mengtian Huang,Shilong Piao,Ivan A. Janssens,Zaichun Zhu,Tao Wang,Donghai Wu,Philippe Ciais,Ranga B. Myneni,Marc Peaucelle,Shushi Peng,Hui Yang,Josep Peñuelas
标识
DOI:10.1038/s41559-017-0328-y
摘要
Warming is projected to increase the productivity of northern ecosystems. However, knowledge on whether the northward displacement of vegetation productivity isolines matches that of temperature isolines is still limited. Here we compared changes in the spatial patterns of vegetation productivity and temperature using the velocity of change concept, which expresses these two variables in the same unit of displacement per time. We show that across northern regions (>50° N), the average velocity of change in growing-season normalized difference vegetation index (NDVIGS, an indicator of vegetation productivity; 2.8 ± 1.1 km yr−1) is lower than that of growing-season mean temperature (T GS; 5.4 ± 1.0 km yr−1). In fact, the NDVIGS velocity was less than half of the T GS velocity in more than half of the study area, indicating that the northward movement of productivity isolines is much slower than that of temperature isolines across the majority of northern regions (about 80% of the area showed faster changes in temperature than productivity isolines). We tentatively attribute this mismatch between the velocities of productivity and temperature to the effects of limited resource availability and vegetation acclimation mechanisms. Analyses of ecosystem model simulations further suggested that limited nitrogen availability is a crucial obstacle for vegetation to track the warming trend. Here the concept of climate-change velocity is used to explore whether northward displacement of vegetation will keep pace with temperature under climate change. Remote sensing data suggest it will not, possibly due to resource availability.
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